+-----------------++------------------------++------------------------+ |Cause of || Explosions up to June || Explosions in the 4 | |explosion. || 1866. ||years from June 1866 to | | || || June 1870. | | |+--------+--------+------++--------+--------+------+ | ||English.|Foreign.|Total.||English.|Foreign.|Total.| +=================++========+========+======++========+========+======+ |Worn out, || 92 | 53 | 145 || 89 | 5 | 94 | |corroded, or || | | || | | | |burnt plates || | | || | | | +-----------------++--------+--------+------++--------+--------+------+ |Undue pressure, || 132 | 5 | 137 || 25 | 6 | 31 | |overloaded || | | || | | | |valves, || | | || | | | |intentional or || | | || | | | |from carelessness|| | | || | | | +-----------------++--------+--------+------++--------+--------+------+ |Bad || 136 | 108 | 244 || 69 | 8 | 77 | |construction, || | | || | | | |weak tubes, || | | || | | | |defective || | | || | | | |fittings or || | | || | | | |stays, or want || | | || | | | |of repair || | | || | | | +-----------------++--------+--------+------++--------+--------+------+ |Shortness of || 106 | 8 | 114 || 28 | 2 | 30 | |water, formation || | | || | | | |of scale or mud, || | | || | | | |or external || | | || | | | |flues set too || | | || | | | |high || | | || | | | +-----------------++--------+--------+------++--------+--------+------+ |Extraneous || 6 | 3 | 9 || 2 | .. | 2 | |causes, || | | || | | | |lightning, fire, || | | || | | | |gas, &c. || | | || | | | |-----------------++--------+--------+------++--------+--------+------+ |Too uncertain to || 247 | 150 | 397 || 6 | 325 | 331 | |be classified || | | || | | | |=================++========+========+======++========+========+======+